Carl, a cleaner at a College, spots that a class are missing a Lecturer, and steps in. It's a charming little story, but it is so far fetched that it beggars belief. Did nobody question his credentials, what happened to the Lecturer that was off sick, was no official replacement sent? I'm being unkind, it's television, what worked for me was the humour, Carl was likeable enough, Shobna Gulati was lots of fun as his boss.
The greatest problem for this one was the inevitability about every plot line, you just knew he was going to get caught, you just knew he was going to move out from his slob of a housemate, and you obviously knew he was going to end up at a University, studying to become a lecturer.
It was pleasing enough to watch, perhaps it expects you to suspend reality for too long. 6/10